Fig. (7) Strain and top displacement histories of JPOT-8 at column 1: (a) Strain history of JPOT-8 at 0.3g, (b) Displacement history of JPOT-8 at 0.3g, (c) Strain history of JPOT-8 at 0.4g d) Displacement history of JPOT-8 at 0.4g.